You can’t start charging right off the bat without your audience knowing anything about the value you offer (though you could still indirectly earn money from them with the right ads). “The best way to go in terms of a long-term passive income business [is] delivering value and information for free, and therefore establishing expertise, knowledge and trust with your audience,” says Flynn.
Active income is needed because you know you can always push away to bring in steady income. Passive income is needed to bring in a little extra on the side. You must ensure to never put all your eggs in one basket. When generating multiple streams of income, you must have different sources to rely on – because in the end, nothing is 100% reliable.

Vending machines are not completely passive but are similar to being a real estate investor with lower stakes. The key to making these successful is to get high value locations and negotiate good deals with the people who own those locations. You need to decide which machines you want to run, get the necessary licenses to operate them (you're selling items so you need to get sales licenses and whatnot from your state), buy the machines and a truck for the items in the machines, find a supplier of the products, and then finally you can secure locations. Finally, you need to service them periodically or hire someone to service them.
There are a ton of ways to diversify your investments, some of which can send real income your way. By opening a brokerage account and investing in ETFs or mutual funds, you can earn real returns you can use to supplement your income. Of course, the flip side can also happen – as in, you can lose money. So, make sure you understand the risks before you dive in.